feat(frontend): switch the default site accent from cyan to emerald

Recolor the site-level --color-ice default and glow from #5cc8e7 to #34d399
and align the decorative VoxelScene/ParticleField accent and the DevTools
greeting. ClickGui/mod theme accents (classic preset) are left untouched; the
avatar success notice now reads as positive green via tone=success.

frontend/src/index.css

@@ -9,7 +9,7 @@
   --color-shoal: #1f3238;
   --color-frost: #9fb3b0;
   --color-snow: #eef5f3;
-  --color-ice: #5cc8e7;
+  --color-ice: #34d399;
   --color-ember: #e8835a;
 
   --font-display: "Unbounded Variable", system-ui, sans-serif;
@@ -29,12 +29,12 @@
 @property --color-ice {
   syntax: "<color>";
   inherits: true;
-  initial-value: #5cc8e7;
+  initial-value: #34d399;
 }
 @property --page-accent-glow {
   syntax: "<color>";
   inherits: true;
-  initial-value: rgb(92 200 231 / 0.35);
+  initial-value: rgb(52 211 153 / 0.35);
 }
 
 @layer base {

frontend/src/pages/app/ConfigsPage.tsx

@@ -4,7 +4,7 @@ import { VoxelScene } from '@features/landing/effects/VoxelScene'
 import { SlotGrid } from '@features/configs/components/SlotGrid'
 import { PageTitle } from '@shared/layout/PageTitle'
 
-const ACCENT = 'rgb(92, 200, 231)'
+const ACCENT = 'rgb(52, 211, 153)'
 
 export default function ConfigsPage() {
   const { t } = useTranslation('configs')

frontend/src/pages/showcase/ListingPage.tsx

@@ -3,7 +3,7 @@ import { ParticleField } from '@features/landing/effects/ParticleField'
 import { VoxelScene } from '@features/landing/effects/VoxelScene'
 import { ListingDetail } from '@features/showcase/components/ListingDetail'
 
-const ACCENT = 'rgb(92, 200, 231)'
+const ACCENT = 'rgb(52, 211, 153)'
 
 export default function ListingPage() {
   const { id } = useParams<{ id: string }>()

frontend/src/pages/showcase/ShowcasePage.tsx

@@ -4,7 +4,7 @@ import { VoxelScene } from '@features/landing/effects/VoxelScene'
 import { ListingList } from '@features/showcase/components/ListingList'
 import { PageTitle } from '@shared/layout/PageTitle'
 
-const ACCENT = 'rgb(92, 200, 231)'
+const ACCENT = 'rgb(52, 211, 153)'
 
 export default function ShowcasePage() {
   const { t } = useTranslation('showcase')

frontend/src/shared/easter/consoleGreeting.ts

@@ -2,7 +2,7 @@ import { LOGO_ART } from './art.generated'
 
 export function printConsoleGreeting(lang: string): void {
   const ru = lang.startsWith('ru')
-  console.log(`%c${LOGO_ART}`, 'color:#5cc8e7;font-family:monospace;font-weight:bold')
+  console.log(`%c${LOGO_ART}`, 'color:#34d399;font-family:monospace;font-weight:bold')
   console.log(
     `%c${ru ? 'Открыл DevTools? Значит, тебе тут рады.' : 'Opened DevTools? You are welcome here.'}`,
     'color:#eef5f3;font-size:13px',